1
AIEEE 2003
+4
-1
A rocket with a lift-off mass $$3.5 \times {10^4}\,\,kg$$ is blasted upwards with an initial acceleration of $$10m/{s^2}.$$ Then the initial thrust of the blast is
A
$$3.5 \times {10^5}N$$
B
$$7.0 \times {10^5}N$$
C
$$14.0 \times {10^5}N$$
D
$$1.75 \times {10^5}N$$
2
AIEEE 2003
+4
-1
Three forces start acting simultaneously on a particle moving with velocity, $$\overrightarrow v \,\,.$$ These forces are represented in magnitude and direction by the three sides of a triangle $$ABC$$. The particle will now move with velocity
A
less than $$\overrightarrow v \,$$
B
greater than $$\overrightarrow v \,$$
C
$$\left| v \right|$$ in the direction of the largest force $$BC$$
D
$$\overrightarrow v \,\,,$$ remaining unchanged
3
AIEEE 2003
+4
-1
A horizontal force of $$10$$ $$N$$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $$0.2$$. The weight of the block is
A
$$20N$$
B
$$50N$$
C
$$100N$$
D
$$2N$$
4
AIEEE 2002
+4
-1
A lift is moving down with acceleration $$a.$$ A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively
A
$$g,g$$
B
$$g-a, g-a$$
C
$$g-a, g$$
D
$$a, g$$
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